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Old October 12th 16, 06:31 AM posted to sci.geo.satellite-nav
Terry Pinnell[_3_]
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Posts: 9
Default Why are a few timestamps missing?

I've been examining the GPS recordings of walks made on my iPhone. The
GPX files should of course contain one text line for each position
recorded, containing position, altitude and a timestamp. But
occasionally (less than 1%) the timestamp is obviously missing. The
4th line of this small extract shows an example:


trkpt lat="50.5573593826"
lon="-4.9283146486"ele22/eletime2016-08-03T09:57:59Z/time/trkpt

trkpt lat="50.5573615199"
lon="-4.9283183366"ele22/eletime2016-08-03T09:58:06Z/time/trkpt

trkpt lat="50.5573525932"
lon="-4.9283242878"ele22/eletime2016-08-03T09:58:07Z/time/trkpt

trkpt lat="50.5573393079" lon="-4.9283319153"ele22/ele/trkpt

trkpt lat="50.5573267350"
lon="-4.9283414707"ele22/eletime2016-08-03T09:58:08Z/time/trkpt

trkpt lat="50.5573160900"
lon="-4.9283459131"ele21/eletime2016-08-03T09:58:10Z/time/trkpt

trkpt lat="50.5573066185"
lon="-4.9283490144"ele22/eletime2016-08-03T09:58:11Z/time/trkpt

trkpt lat="50.5573010445"
lon="-4.9283564743"ele22/eletime2016-08-03T09:58:12Z/time/trkpt

trkpt lat="50.5572247692"
lon="-4.9284306541"ele21/eletime2016-08-03T09:58:20Z/time/trkpt

How does that flaw arise please? I can understand that for various
reasons, recorded trackpoints may be missing completely, or wildly
inaccurate. But how can some be without a timestamp?

--
Terry, East Grinstead, UK